CN102721864B - System and method for time-staggered acquisition of high-frequency electric-arc signal - Google Patents
System and method for time-staggered acquisition of high-frequency electric-arc signal Download PDFInfo
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- CN102721864B CN102721864B CN201210137817.4A CN201210137817A CN102721864B CN 102721864 B CN102721864 B CN 102721864B CN 201210137817 A CN201210137817 A CN 201210137817A CN 102721864 B CN102721864 B CN 102721864B
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Abstract
Disclosed are a system and a method for time-staggered acquisition of high-frequency electric-arc signals, belonging to the field of welding control. The system comprises a spectrometer, a high-speed camera, a voltage sensor, a current sensor, a touch screen, a serial communication circuit, an MCU controller, an isolation circuit, a signal amplifying circuit, a power circuit and a signal acquisition circuit. As a main control device, the MCU sets the number of sampling points per period, N, through the serial communication circuit and HMI communication, and electric-arc signals acquired by the current sensor and the voltage sensor are inputted into the MCU controller through the signal acquisition circuit for analytical processing. PWM signals sent by the MCU controller control the spectrometer and the high-speed camera through the isolation circuit and via signal amplifying and outputting. Directly converting target signals into square waves by adopting a voltage comparator means directly obtaining signal frequencies of the target signals. The method can be used to acquire high-frequency electric-arc signals. With the method, errors caused by measurement and acquisition can be avoided, thus making it a method with high accuracy.
Description
Technical field
The present invention proposes a kind of hf electric arc signal to stagger the time acquisition system and method, relate to welding control field.
Background technology
Pulse TIG welding has the advantage of uniqueness in energy density, hot input control, appearance of weld memory welding quality etc. improving, the application in recent years in manufacturing industry is increasingly extensive.But the applying frequency of pulsed arc is generally at below 30KHz at present.Impact is caused very large difficulty to the acquisition authenticity of arc signal by the further raising of frequency.
Summary of the invention
In order to the acquisition problems of high-frequency signal can be realized, present invention employs the method for staggering the time and gathering, gather multiple point in cycles, be then integrated into a complete cycle, in order to reflect truth.Specific embodiments is as follows:
Hf electric arc signal is staggered the time acquisition system: comprise spectrometer, high-speed camera, voltage sensor, current sensor, touch-screen, serial communication circuit, MCU controller, buffer circuit, signal amplification circuit, power circuit, signal acquisition circuit. and wherein MCU controller is as main control equipment by serial communication circuit and HMI communications setting each cycle sampling number N, and the arc signal that current sensor, voltage sensor collect then carries out analyzing and processing by signal acquisition circuit input MCU controller.The pwm signal that MCU controller sends amplifies to export by buffer circuit and signal and controls spectrometer and high-speed camera.
Signal acquisition circuit: the high-frequency signal that the input end input of signal acquisition circuit is gathered from welding gear by Hall current sensor, is then input to MUC controller after comparer U6.
Buffer circuit, the 4 road pwm signals that MCU controller sends, export respectively after high speed photo coupling O1, high speed photo coupling O2, high speed photo coupling O3, high speed photo coupling O4.The independent current source of buffer circuit connects the current circuit that rectification chip U7 and electric capacity forms again and forms after connecting DC-DC chip U8 by the delivery outlet of the power supply chip 7805 of power circuit.
Signal amplification circuit, exports after the pwm signal exported access comparer U9 carries out signal amplification after described high speed photo coupling O1, high speed photo coupling O2, high speed photo coupling O3, high speed photo coupling O4.
Power circuit, power circuit is made up of external power source and rectification chip U1 and rectification chip U2 and resistance capacitance.
Serial communication circuit, the serial communication signal that MCU controller exports is connected to serial ports joint and exports after RS232 communication interface chip U4.
MCU controller, employing model is 32 Cortex M3 microprocessors based on ARM kernel of STM32F103RBT6.
A kind of hf electric arc signal is staggered the time acquisition method, signal is as Fig. 1: the first step: voltage sensor and current sensor are using the arc signal input signal Acquisition Circuit that the collects input signal as voltage comparator U6, the output signal of voltage comparator U6 is the same cycle synchronous with input signal is the square-wave signal of T1, obtains the cycle of measured signal.MCU controller is inputted using the output signal of voltage comparator U6 as fundamental frequency signal.Second step: by each cycle sampling number N in touch-screen setting program, then have t=T1/N, and be input to MCU controller by serial communication circuit.3rd step: the cycle T 1 rear output cycle that MCU controller obtains the square-wave signal that voltage comparator U6 exports is the pwm signal of T2, and the relationship of the two is T2=n × T1+ t.The pwm signal that MCU controller exports exports the drive singal as spectrometer and high-speed camera by buffer circuit and amplifying circuit.Spectrometer, high-speed camera gather arc signal at the rising edge of pwm signal.The image information gathering gained is superposed, just can obtain the complete cycle information of measured signal.
Wherein: T1 is input signal cycle, N is the sampling number of signal each cycle, the pwm signal cycle that T2 exports for MCU controller, and t is every two adjacent sampled point interval times.
The present invention utilizes voltage comparator to realize frequency collection to measured signal, after inputting MCU with measured signal with the square-wave signal of cycle T 1.By software cycle be T2 target P WM and as trigger collection signal.Adopt voltage comparator directly echo signal to be changed into square wave to equal directly to obtain its signal frequency, can be used for gathering high-frequency arc signal, avoid the error measured and gather and cause, accuracy is high.
Accompanying drawing explanation
Fig. 1. acquisition method schematic diagram of staggering the time;
Fig. 2. schematic block diagram of the present invention;
Fig. 3. MCU control circuit of the present invention;
Fig. 4. serial communication circuit of the present invention;
Fig. 5. signal acquisition circuit;
Fig. 6. buffer circuit;
Fig. 7. signal amplification circuit;
Fig. 8. feed circuit;
Fig. 9. isolated part feed circuit;
Figure 10. method flow diagram of the present invention;
Embodiment
The specific embodiment of the present invention will the present invention is described in detail by reference to the accompanying drawings.
Native system is primarily of HMI, serial communication circuit, MCU controller, buffer circuit, operational amplification circuit, power circuit, spectrometer, high-speed camera, voltage sensor, current sensor composition.
Power circuit is that whole circuit board is powered as shown in Figure 2, and the control signal of MCU and signal amplify between filtering circuit, and the signal isolation between input signal and MCU is realized by buffer circuit.During system works, input signal and voltage comparator reference voltage compare that output frequency is identical with input signal cuts synchronous pulse signal, and are input in MCU.Operator passes through PWM dutycycle and the frequency of HMI setting signal acquisition system need of work, HMI and MCU controller is connected by serial communication circuit, MCU receives the dutycycle and frequency information that serial communication circuit sends, and the pwm signal that a period of time time delay exports corresponding dutycycle and frequency is again increased on the frequency base of HMI setting, be used for driving the signal collecting devices such as spectrometer.Then be equivalent to the diverse location collection signal at same period.Reach to high-frequency signal stagger the time gather object.
Fig. 3 is MCU part of the present invention, and USART_TX, USART_RX are serial communication pin, and being connected respectively at U4 realizes serial communication.PWM1-4 is pwm signal output pin, is connected respectively with the 1-4 pin of U8, crystal oscillator Y1 and two ends starting of oscillation electric capacity with the use of, for system provides clock source.37 pin of MCU are square-wave signal input pin.
Fig. 4 is serial communication circuit of the present invention, is inputted the PWM frequency and sampled point number that need, be sent to MCU, complete the setting of target P WM by serial communication by HMI.U4(232 chip) connect HMI and MCU.U4 is by realizing the serial communication of HMI and MCU based on the level conversion of 232 standards.
Fig. 5 is signals collecting partial circuit figure, as shown in FIG., external signal accesses U6A by connection terminal P2, U6A and R4 forms voltage follower, voltage follower output voltage is similar to input voltage amplitude, and be high-impedance state to front stage circuits, be low resistive state to late-class circuit, thus buffer action played to front stage circuit.U6B and R5, R6 form zero-crossing comparator, irregular arc signal are converted into the square-wave signal of same frequency.
Fig. 6 is buffer circuit, and the output of control signal adopts high speed photo coupling to export.Pwm signal is input to the input end of each PWM output channel optocoupler respectively through U8, and wherein U8 plays the amplification to pwm signal, improves the driving force of signal, make to drive optocoupler, and the use of optocoupler achieves the isolation and amplifier of signal.
Fig. 7 is operational amplification circuit, and as shown in the figure, the A of U9, B, C, D tetra-output of tunnel amplifier normal phase input end connection control signal PWM1-4 respectively, pwm signal outputs to respective terminal pins after amplifier amplifies 3 times.U9 power supply from DC-DC, (explaining at power unit).
Fig. 8 is system power supply partial circuit figure, inputs 9V direct supply, through capacitor filtering, be input to power conversion chip U1 to current-limiting resistance R1 in terminals P 1 by outside, exports 5V power supply, exports 3.3V power supply, for system components is powered equally by power conversion chip U2.
Fig. 9, be isolated part power supply schematic diagram, DC-DC input end power supply takes from U1, and export 15V power supply, for U9 powers, U7 power conversion chip input end takes from DC-DC output terminal 15V power supply, and U7 exports 5V power supply, for high speed photo coupling collector power.Such external unit and internal system use optocoupler to achieve sufficient isolation.Optocoupler and system coupling part adopt system power supply to power, and optocoupler and external unit coupling part adopt DC-DC output end power to power, and adequately protected the safety of system.
In the present invention, 232 bus interface expanded by MCU controller, and this interface can communicate with HMI.On HMI, PWM dutycycle and frequency setting can be carried out and show the data received in real time.
Hf electric arc signal is staggered the time acquisition method in the present embodiment, signal is as Fig. 1: the first step: voltage sensor and current sensor are using the arc signal input signal Acquisition Circuit that the collects input signal as voltage comparator U6, the output signal of voltage comparator U6 is the same cycle synchronous with input signal is the square-wave signal of T1, obtains the cycle of measured signal.MCU controller is inputted using the output signal of voltage comparator U6 as fundamental frequency signal.Second step: by each cycle sampling number N in touch-screen setting program, then have t=T1/N, and be input to MCU controller by serial communication circuit.3rd step: the cycle T 1 rear output cycle that MCU controller obtains the square-wave signal that voltage comparator U6 exports is the pwm signal of T2, and the relationship of the two is T2=n × T1+ t.The pwm signal that MCU controller exports exports the drive singal as spectrometer and high-speed camera by buffer circuit and amplifying circuit.Spectrometer, high-speed camera gather arc signal at the rising edge of pwm signal.The image information gathering gained is superposed, just can obtain the complete cycle information of measured signal.
Wherein: T1 is input signal cycle, N is the sampling number of signal each cycle, the pwm signal cycle that T2 exports for MCU controller, and t is every two adjacent sampled point interval times.
Claims (3)
1. hf electric arc signal is staggered the time acquisition system, it is characterized in that: it comprises spectrometer, high-speed camera, voltage sensor, current sensor, touch-screen, serial communication circuit, MCU controller, buffer circuit, signal amplification circuit, power circuit, signal acquisition circuit; Wherein MCU controller is as main control equipment by serial communication circuit and HMI communications setting each cycle sampling number N, and the arc signal that current sensor, voltage sensor collect then carries out analyzing and processing by signal acquisition circuit input MCU controller; The pwm signal that MCU controller sends controls spectrometer and high-speed camera by the output of buffer circuit and signal amplification circuit;
Signal acquisition circuit: the high-frequency signal that the input end input of signal acquisition circuit is gathered from welding gear by Hall current sensor, is then input to MCU controller after comparer U6;
Buffer circuit, the 4 road pwm signals that MCU controller sends, export respectively after high speed photo coupling O1, high speed photo coupling O2, high speed photo coupling O3, high speed photo coupling O4; The independent current source of buffer circuit connects the current circuit that rectification chip U7 and electric capacity forms again and forms after connecting DC ?DC chip U8 by the delivery outlet of the power supply chip 7805 of power circuit;
Signal amplification circuit, exports after the pwm signal exported access comparer U9 carries out signal amplification after described high speed photo coupling O1, high speed photo coupling O2, high speed photo coupling O3, high speed photo coupling O4;
Power circuit, power circuit is made up of external power source and rectification chip U1 and rectification chip U2 and resistance capacitance;
Serial communication circuit, the serial communication signal that MCU controller exports is connected to serial ports joint and exports after RS232 communication interface chip U4.
2. hf electric arc signal according to claim 1 is staggered the time acquisition system, it is characterized in that: described MCU controller adopts model to be 32 Cortex M3 microprocessors based on ARM kernel of STM32F103RBT6.
3. a hf electric arc signal is staggered the time acquisition method, it is characterized in that: the first step: voltage sensor and current sensor are using the arc signal input signal Acquisition Circuit that the collects input signal as voltage comparator U6, the output signal of voltage comparator U6 is the same cycle synchronous with input signal is the square-wave signal of T1, obtains the cycle of measured signal; MCU controller is inputted using the output signal of voltage comparator U6 as fundamental frequency signal; Second step: by each cycle sampling number N in touch-screen setting program, then have Δ t=T1/N, and be input to MCU controller by serial communication circuit; 3rd step: the cycle T 1 rear output cycle that MCU controller obtains the square-wave signal that voltage comparator U6 exports is the pwm signal of T2, and the relationship of the two is T2=n × T1+ Δ t; The pwm signal that MCU controller exports exports the drive singal as spectrometer and high-speed camera by buffer circuit and amplifying circuit; Spectrometer, high-speed camera gather arc signal at the rising edge of pwm signal; The image information gathering gained is superposed, just can obtain the complete cycle information of measured signal;
Wherein: T1 is input signal cycle, N is the sampling number of signal each cycle, the pwm signal cycle that T2 exports for MCU controller, and Δ t is every two adjacent sampled point interval times.
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| CN108508336A (en) * | 2018-05-16 | 2018-09-07 | 深圳供电局有限公司 | Multi-parameter detection system and method for gas arcing characteristic and arc extinguishing performance |
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| CN101706527B (en) * | 2009-10-30 | 2012-01-04 | 西安交通大学 | Method for detecting arc faults based on time-frequency characteristics of high-frequency current component |
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Granted publication date: 20150114 Termination date: 20170504 |